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is it ok for a 6ft tall person to use 170mm cranks, or will it not feel right? im cureently using 175mm and they feel great, by the way its a 29er, with an 11/34 cassette and the bike is a large...
 

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Other than being different than what you're used to, they'll be fine. It's a diference of less than 1/4 inch, or about 3%, so not exactly a life changing difference.

BTW, why are you switching?
 

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david8613 said:
is it ok for a 6ft tall person to use 170mm cranks, or will it not feel right? im cureently using 175mm and they feel great, by the way its a 29er, with an 11/34 cassette and the bike is a large...
I certainly noticed the difference going from 170 to 175....

My knees hurt for the first week...

Then it felt like I could finally take a full step

BTW the extra torque is worth about 1 sprocket tooth on the 34 ring.
 

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I am also 6' tall. I have one bike with 170, one with 172.5 and one with 175. I can notice a slight difference, but it doesn't bother me. I think my next bike will be 170 for the extra clearance.
 
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